Clearblue

So I started getting faint positives on cheap amazon tests but the lines never got darker. This was on the 11th. On the 12th (day of missed period) I took a frer digital and got a pregnant symbol. On the 14th I took a clearblue digital before bed and got a not pregnant and then again this morning with FMU. What gives?

With my chemical pregnancy I got maybe 1 or 2 positives then stark white tests and then started to miscarry. I am still getting second lines on the pink dyes. Are the clearblue digitals just not sensitive? I guess I am pretty early still but I just dont know what to think.

Edited to add: my period was due on the 12th so I'm techinically like 2-3 days late.